A slot car (sometimes, slotcar) is a powered miniature auto or other vehicle that is guided by a groove or slot in the track on which it runs.
MoveOn is a community of more than 8 million Americans from all walks of life who use the connective power of the Internet to lead, participate in, and win campaigns for progressive change.
Motion, move, movement refer to change of position in space. Motion denotes change of position, either considered apart from, or as a characteristic of, something that moves; usually the former, in which case it is often a somewhat technical or scientific term: perpetual motion.